Immunomodulation of TGF-beta 1 in mdx mouse inhibits connective tissue proliferation in diaphragm but increases inflammatory response: implications for antifibrotic therapy

Journal of Neuroimmunology
Francesca AndreettaPaolo Confalonieri

Abstract

Irreversible connective tissue proliferation in muscle is a pathological hallmark of Duchenne muscular dystrophy (DMD), a genetic degenerative muscle disease due to lack of the sarcolemmal protein dystrophin. Focal release of transforming growth factor-beta1 (TGF-beta1) is involved in fibrosis development. Murine muscular dystrophy (mdx) is genetically homologous to DMD and histopathological alterations comparable to those in DMD muscles occur in diaphragm of older mdx mice. To investigate the early development of fibrosis and TGF-beta1 involvement, we assessed diaphragms in 6-36-week-old mdx and C57/BL6 (control) mice for fibrosis, and used real-time PCR and ELISA to determine TGF-beta1 expression. Significantly greater fibrosis and TGF-beta1 expression were found in mdx from the 6th week. Mice treated with neutralizing antibody against TGF-beta1 had lower levels of TGF-beta1 protein, reduced fibrosis, unchanged muscles fiber degeneration/regeneration, but increased inflammatory cells (CD4+lymphocytes). These data demonstrate early and progressive fibrosis in mdx diaphragm accompanied by TGF-beta1 upregulation. Reduction of TGF-beta1 appears promising as a therapeutic approach to muscle fibrosis, but further studies are requir...Continue Reading

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